Floyd Mayweather said in an upcoming interview with Showtime that at this moment he's not interested in a rematch with Manny Pacquiao "because he's a sore loser and he's a coward."

The interview was recorded late Tuesday night and will air Saturday night after the network's replay of boxing's richest fight, which Mayweather won by decision last weekend in Las Vegas to stay undefeated.

Asked if he thought Pacquiao was hampered by the right shoulder injury that later required surgery, Mayweather tells Jim Gray, "Absolutely not."

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Mayweather acknowledges that he earlier texted ESPN's Stephen A. Smith to say he welcomed a rematch.

"Yeah, but I change my mind," Mayweather said. "At this particular time, no, because he's a sore loser and he's a coward. . If you lost, accept the loss and say, 'Mayweather, you were the better fighter.'"